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In this paper, we study the dynamics of absolute return, trading volume and bid-ask spread after the trading halts using high-frequency data from the Shanghai Stock Exchange. We deal with all three types of trading halts, namely intraday halts, one-day halts and inter-day halts, of 203 stocks in Shanghai Stock Exchange from August 2009 to August 2011. We find that absolute return, trading volume, and in case of bid-a…
We study whether crypto-style perpetual-futures mechanics can be applied to a binary event claim that ultimately pays 0 or 1. A synthetic long entered at price p0 with collateral xp0/L has terminal equity -xp0(1-1/L) when the claim pays 0, if the position survives to resolution without a top-up, close, or conversion. Thus any L > 1 creates an adverse-outcome account shortfall under these conditions, independent of th…
We propose an optimal iterative scheme for federated transfer learning, where a central planner has access to datasets ${\cal D}_1,\dots,{\cal D}_N$ for the same learning model $f_θ$. Our objective is to minimize the cumulative deviation of the generated parameters $\{θ_i(t)\}_{t=0}^T$ across all $T$ iterations from the specialized parameters $θ^\star_{1},\ldots,θ^\star_N$ obtained for each dataset, while respecting …
The use of the trading halts is a practice common to all markets. However, the advantages and the disadvantages of the measurements are regularly discussed. The partisans think that the trading suspensions or the price limits make it possible to the investors to have time to react to the new information. The detractors think that the trading halts are barriers with the trade. A theorical debate thus continued with an…
Early stopping treats training time as a capacity knob: halt when a validation metric stops improving so the model does not wander into overfit.
A circuit breaker is an exchange halt when prices move too far too fast — a pause so the book can rebuild, not a valuation.